Pneumatic tool.



Patented Det. 30,1900.

H.. G.-K0TTEN.

PNEUMATIC TUUL.

No. 660,357:T

l (Application led 11, `1900A (No Model.)

UNITED STATES PATENT OFFICE.-

I-IERMAN G. KOTTEN, OF ENGLEWOOD, NEW JERSEY.

PN EU MATIC TOOL.

SPECIFICATIONforming part of Letters Patent No. 660,857, datd ctole 30, 1900.

Application filed January l1, 1900. Serial No. 1,098. (No model.)

provenient is fully set forth in the following specification and accompanying drawings.

My invention relates to an improved construction of a pneumatic tool; andit consists more especially of the novel construction of piston orhammerhaving therein an unbroken exterior periphery,'but provided with a longitudinally-extending recess which is always open tov fluid-pressure, the cylinder of said tool being provided with ports and passages for admitting and exhausting the motive fluid to and from each end of the tool.

It further consists of novel details of construction, all as will be hereinafter fully described, and particularly pointed out in the claims.

Figure 1 representsalongitudinal sectional view of a pneumatic tool embodying my invention. Fig. 2 represents a view similar to Fig. 1, but showing the hammer thereof in an opposite position to that seen in said Fig. 1,.

Fig. 3 represents a sectional view of the hammer on line Fig. 1.

Similar numerals of reference indicate cor-v` responding parts in the-figures.

Referring to the drawings, the motive fluid leaving its bearing 11 and carrying with it.

the striker 12, which leaves the chisel-bushing 13. The parts now appear as seen in Fig.

2, the exhaust being permitted, when the hammer is moving toward the chisel, through the port 13, passage 14, and port 15 to the atmosphere, while the exhaust from the inlet end of the cylinder can take place at the proper time through the port 16, as is evident. The parts being now in the position seen in Fig.

2, the motive fluid passes through the longitudinally-extending recess 4 ports A17, pas sages 18, and ports 19 to the inlet end of the cylinder, whereupon the hammer 5 moves to the left'of the position seen in Fig. 2, the exhaust taking place through the port 13, as already explained, as is evident.

I desire to call especial attention to the lfact that I employ a solid hammer whose exterior periphery is of uniform diameter throughout, with the exception of the longitudinally-extending recess 4, whereby the life of the hammer and cylinder is indefinitely prolonged. Thelongitndinally-extendingrecess 4 is located on both sides of the hammer '5, and it will be apparent that it is much cheaper to manufacture hammers of this character than hammers having annular grooves therein, as has been done heretofore in this same class of invention. It `will also be noted that by my construction, wherein I employ more passages 18 than passages 7, a rapid or accelerated movement will be impart-ed to the hammer toward the chisel end, the motive duid flowing into the ports 6 through the annular passage 20 'and' into the ports 17 through the annular passage 2l.

The inlet-piece 22 is preferably in,threaded engagement with the cylinder, and the abutting faces of said cylinder and inlet-piece are provided with ratchet-teeth 23, which are engaged by the spring-pressed catch 24. The inlet-piece is further provided with an extension 25, having a hose-coupling connection thereon, whereby the tool can be readily coupled to and nncoupled from the hose which conveys the supply of motive fluid to the tool.

It will be apparent that slight changes may be made by those skilled in the art which will come within the scope of my invention, and I do not, therefore, desire to be limited in every instance Ato the exact construction I have herein shown'and described. Y

yHaving thus described my invention, what l claim as new, and desire to securel by Letters Patent, is

1. In a pneumatic tool', a cylinder,va solid hammer therein, having an unbroken exterior periphery, but provided with longitudinallyextending recesses on either side thereof, a groove in the inner periphery of said cylinder IOO always in communication with said recesses, an inlet-port in said cylinder leading to said groove, other grooves in the inner periphery of said cylinder on either side of said rstmentioned groove, and ports and passages for admitting and exhausting theL motive tiuid from either end of said cylinder.

2. In a pneumatic tool, a hammer having an exterior periphery of a uniform diameter, a longitudinally-extending recess in said hammer, said recess being always in communica tion with duid-pressure through the groove 3 in the inner periphery of the cylinder, ports 6, passages '7, and ports 8 for admitting the motive fluid to one end of said hammer, ports 17, passages 18 and ports 19 for admitting motive tluid to the opposite end of said ha1nmer, the number of said last-mentioned ports being greater than the first-mentioned ports, whereby a rapid movement toward the chisel end of the hammer is attained, grooves 2O and 21 on either side of said groove 3 and communicating with said ports 6 and 17 respectively, and means for exhausting from each end of said hammer.

3. In a pneumatic tool, a cylinder, a hammer having a periphery of uniform diameter, a recess in said hammer, the chisel end of the latter being provided with a reduced portion 10 having a bearing 11, a striker 12 attached to said reduced portion, a chiselbushing 13 having an opening therein for the entrance of said striker, an annular groove 3 in said cylinder always open to f'luid-pressure, and annular grooves 2O and 21 on either side thereof, which are alternately placed in com munication with said groove 3 through the recess in said hammer, in combination with ports and passages leading in eitherdirection from said grooves 2O and 21 to the ends of said h am mer.

HERMAN G. KO'l"EN.

lVi tnesses:

JOHN A. WIEDERSHEIM, WM. CANER WIEDERSHEIM. 

